Length of life (hours) 1,000–1,199 The following table gives the length of life of 400 radio tubes: Length of life (hours) No of Radio tubes No. of Radio tubes 12 2,000-2,199 55 1,200–1,399 30 36 2,200-2,399 1,400–1,599 65 2,400-2,599 25 1,600-1,799 78 2,600-2,799 9 1,800–1,999 Calculate (i) the average length of life of a radio tube, (ii) the standard deviation of the length of life of a tube and (iii) the percentage number of tubes where length of life of a tube falls within + 20. 90

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